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Global Existence of Small Amplitude Solutions for a Model Quadratic Quasilinear Coupled Wave-Klein-Gordon System in Two Space Dimension, with Mildly Decaying Cauchy Data
About this Title
A. Stingo
Publication: Memoirs of the American Mathematical Society
Publication Year:
2023; Volume 290, Number 1441
ISBNs: 978-1-4704-5992-5 (print); 978-1-4704-7627-4 (online)
DOI: https://doi.org/10.1090/memo/1441
Published electronically: September 29, 2023
Keywords: Global solution of coupled wave-Klein-Gordon systems,
Klainerman vector fields,
Semiclassical analysis
Table of Contents
Chapters
- 1. Introduction
- 2. Main Theorem and Preliminary Results
- 3. Energy Estimates
- 4. Uniform Estimates
- Appendix A.
- Appendix B.
Abstract
The aim of this monograph is to study the global existence of solutions to a coupled wave-Klein-Gordon system in space dimension two when initial data are small smooth and mildly decaying at infinity. Some physical models strictly related to general relativity have shown the importance of studying such systems but very few results are known at present in low space dimension. We study here a model two-dimensional system, in which the nonlinearity writes in terms of “null forms”, and show the global existence of small solutions. Our goal is to prove some energy estimates on the solution when a certain number of Klainerman vector fields is acting on it, and some optimal uniform estimates. The former ones are obtained using systematically quasilinear normal forms, in their para-differential version; the latter ones are recovered by deducing a new coupled system of a transport equation and an ordinary differential equation from the starting PDE system by means of a semiclassical micro-local analysis of the problem. We expect the strategy developed here to be robust enough to enable us, in the future, to treat the case of the most general nonlinearities.- Thomas Alazard and Jean-Marc Delort, Sobolev estimates for two dimensional gravity water waves, Astérisque 374 (2015), viii+241 (English, with English and French summaries). MR 3460636
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